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The overall market was slightly lower -- the S&P 500 lost 0.66%, Nasdaq fell 1.20%, and AMEX Oil was 0.43% lower from the previous week.

CELS -- up 0.78% for the week and 4.16% lower than a year ago - tracks U.S.-listed clean-energy companies and is divided into four categories: advanced materials; energy intelligence; energy storage and conversion; and renewable electricity generation and renewable fuels. Of the 53 total component securities, 26 experienced gains and 27 experienced losses.

CELS' best performer for the week was biofuel producer
Green Plains Renewable Energy (GPRE - Get Report), gaining 11.54%. Rounding out the top five CELS performers were energy management firm
EnerNOC(ENOC - Get Report), up 11.48%; Chinese solar power product maker
Trina Solar(TSL - Get Report), higher by 10.82%; semiconductor manufacturer
IXYS Corporation(IXYS - Get Report), up 7.83%; and geothermal project developer
Ormat Technologies(ORA - Get Report), higher by 6.66% for the week.

QWND -- down 1.69% last week and 37.15% lower in the last 12 months -- includes companies that are primarily manufacturers, developers, distributors, installers, and users of energy derived from wind sources. Of QWND's 21 pure play components, 5 experienced gains and 16 lost ground.

QGRD -- 0.10% lower from the previous week - is composed of companies that are primarily involved in the electric grid; electric meters, devices, and networks; energy storage and management; and enabling software used by the smart grid and electric infrastructure sector. Of QGRD's 21 pure play components, 10 experienced positive movement, 10 saw losses, and one ended the week unchanged.